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gopher65 t1_it13dx1 wrote

You need about 10 metres (not a typo) of concrete to have a reasonable chance of shielding against a GCR strike. Lead just makes the strikes worse, so you can't use it. Bulk matters as much as mass for this type of shielding.

I don't know about you, but my phone would be pretty heavy if it had a 30 foot radius sphere of concrete around it to shield it from high energy strikes.

Edit: scratch that. It would be a dome, not a sphere, because the bulk of Earth protects you from the direction of the ground. That makes this shielding much more practical.

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